scholarly journals Fermentative capacity of baker's yeast exposed to hyperbaric stress

2004 ◽  
Vol 26 (15) ◽  
pp. 1237-1240 ◽  
Author(s):  
Ana F. Campelo ◽  
Isabel Belo
Keyword(s):  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Fermentative Capacity ◽  
Hyperbaric Stress

scholarly journals Overexpression of the Calcineurin Target CRZ1 Provides Freeze Tolerance and Enhances the Fermentative Capacity of Baker's Yeast

2007 ◽  
Vol 73 (15) ◽  
pp. 4824-4831 ◽  
Author(s):  
Joaquín Panadero ◽  
Maria José Hernández-López ◽  
José Antonio Prieto ◽  
Francisca Randez-Gil
Keyword(s):  
Target Genes ◽  
Freeze Tolerance ◽  
Baker’S Yeast ◽  
Freezing Process ◽  
Baker's Yeast ◽  
Freeze Resistance ◽  
Fermentative Capacity ◽  
Genes Encoding ◽  
Industrial Strains ◽  
Leavening Ability

ABSTRACT Recent years have shown a huge growth in the market of industrial baker's yeasts (Saccharomyces cerevisiae), with the need for strains affording better performance in prefrozen dough. Evidence suggests that during the freezing process, cells can suffer biochemical damage caused by osmotic stress. Nevertheless, the involvement of ion-responsive transcriptional factors and pathways in conferring freeze resistance has not yet been examined. Here, we have investigated the role of the salt-responsive calcineurin-Crz1p pathway in mediating tolerance to freezing by industrial baker's yeast. Overexpression of CRZ1 in the industrial HS13 strain increased both salt and freeze tolerance and improved the leavening ability of baker's yeast in high-sugar dough. Moreover, engineered cells were able to produce more gas during fermentation of prefrozen dough than the parental strain. Similar effects were observed for overexpression of TdCRZ1, the homologue to CRZ1 in Torulaspora delbrueckii, suggesting that expression of calcineurin-Crz1p target genes can alleviate the harmful effects of ionic stress during freezing. However, overexpression of STZ and FTZ, two unrelated Arabidopsis thaliana genes encoding Cys2/His2-type zinc finger proteins, also conferred freeze resistance in yeast. Furthermore, experiments with Δcnb1 and Δcrz1 mutants failed to show a freeze-sensitive phenotype, even in cells pretreated with NaCl. Overall, our results demonstrate that overexpression of CRZ1 has the potential to be a useful tool for increasing freeze tolerance and fermentative capacity in industrial strains. However, these effects do not appear to be mediated through activation of known salt-responding pathways.

scholarly journals Improved Properties of Baker's Yeast Mutants Resistant to 2-Deoxy-d-Glucose

2001 ◽  
Vol 67 (9) ◽  
pp. 4279-4285 ◽  
Author(s):  
Ana M. Rincón ◽  
Antonio C. Codón ◽  
Francisco Castrejón ◽  
Tahı́a Benı́tez
Keyword(s):  
Ammonium Sulfate ◽  
Baker’S Yeast ◽  
Yeast Nitrogen Base ◽  
Baker's Yeast ◽  
Wild Type ◽  
Organoleptic Properties ◽  
Nitrogen Base ◽  
Fermentative Capacity ◽  
Yeast Mutants ◽  
Spontaneous Mutants

ABSTRACT We isolated spontaneous mutants from Saccharomyces cerevisiae (baker's yeast V1) that were resistant to 2-deoxy-d-glucose and had improved fermentative capacity on sweet doughs. Three mutants could grow at the same rate as the wild type in minimal SD medium (0.17% Difco yeast nitrogen base without amino acids and ammonium sulfate, 0.5% ammonium sulfate, 2% glucose) and had stable elevated levels of maltase and/or invertase under repression conditions but lower levels in maltose-supplemented media. Two of the mutants also had high levels of phosphatase active on 2-deoxy-d-glucose-6-phosphate. Dough fermentation (CO2 liberation) by two of the mutants was faster and/or produced higher final volumes than that by the wild type, both under laboratory and industrial conditions, when the doughs were supplemented with glucose or sucrose. However, the three mutants were slower when fermenting plain doughs. Fermented sweet bakery products obtained with these mutants were of better quality than those produced by the wild type, with regard to their texture and their organoleptic properties.

scholarly journals Evolutionary engineering of Wickerhamomyces subpelliculosus and Kazachstania gamospora for baking

2021 ◽  
Author(s):  
Thandiwe Semumu ◽  
Amparo Gamero ◽  
Teun Boekhout ◽  
Nerve Zhou
Keyword(s):  
Baker’S Yeast ◽  
Carbon Substrate ◽  
Evolutionary Engineering ◽  
Loaf Volume ◽  
Baker's Yeast ◽  
Yeast Saccharomyces Cerevisiae ◽  
Substrate Utilisation ◽  
Fermentative Capacity ◽  
Potential Alternative ◽  
Consumer Lifestyles

Abstract The conventional baker’s yeast, Saccharomyces cerevisiae , is an indispensable baking workhorse of all times. Its monopoly coupled to its major drawbacks such as streamlined carbon substrate utilisation base and a poor ability to withstand a number of baking associated stresses prompt the need to search for alternative yeasts to leaven bread in the era of increasingly complex consumer lifestyles. Our previous work identified the inefficient baking attributes of Wickerhamomyces subpelliculosus and Kazachstania gamospora as well as preliminarily observations of improving fermentative capacity of potential alternative baker’s yeasts using evolutionary engineering. Here we report the characterisation and improvement in baking traits in five out of six independently evolved lines incubated for longer time and passaged for at least 60 cycles relative to their parental strains as well as the conventional baker’s yeast. In addition, evolved clones produced bread with a higher loaf volume when compared to bread baked with either ancestral strain or the control conventional baker’s yeast. Remarkably, our approach improved the yeasts’ ability to withstand baking associated stresses, a key baking trait exhibited poorly in both the conventional baker’s yeast and their ancestral strains. W. subpelliculosus evolved the best characteristics attractive for alternative baker’s yeasts as compared to the evolved K. gamospora strains. These results demonstrate the robustness of evolutionary engineering in development of alternative baker’s yeasts.

COD REDUCTION OF BAKER'S YEAST WASTEWATER USING BATCH ELECTROCOAGULATION

2014 ◽  
Vol 13 (12) ◽  
pp. 3153-3160 ◽  
Author(s):  
Zakaria Al-Qodah ◽  
Mohammad Al-Shannag ◽  
Kholoud Alananbeh ◽  
Nahla Bouqellah ◽  
Eman Assirey ◽  
...  
Keyword(s):  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Cod Reduction ◽  
Yeast Wastewater

The use of β-glucan extracted from baker’s yeast (Saccharomyces cerevisiae) to increase non-specific immune system and resistence of tilapia (Oreochromis niloticus) to Aeromonas hydrophila

2013 ◽  
pp. 92
Author(s):  
Ida N Jamal ◽  
Reiny A Tumbol ◽  
Remy E.P Mangindaan
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Immune System ◽  
Aeromonas Hydrophila ◽  
Phagocytic Activity ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Yeast Saccharomyces Cerevisiae ◽  
Randomized Design ◽  
The Difference ◽  
Motile Aeromonas Septicaemia

Motile Aeromonas Septicaemia disease (MAS) attacking tilapia has increased in recent years as a consequence of intensive aquaculture activities, which led to losses in aquaculture industry. The agent causing MAS disease is Aeromonas hydrophila. The disease can be controlled with the β-glucan. As immunostimulants, β-glucans can also increase resistance in farmed tilapia. Studies on the use of β-glucan extracted from baker's yeast Saccharomyces cerevisiae was intended to evaluate the non-specific immune system of tilapia that were challenged with Aeromonas hydrophila. The method used was an experimental method with a completely randomized design consisting of four treatments with three replicats. The dose of β-glucan used as treatments were 0 mg.kg-1 fish (Control), 5 mg.kg-1 fish (B), 10 mg.kg-1 fish (C) and 20 mg.kg-1 fish (D), each treatment as injected three times at intervals of 3 days, the injection volume of 0.5 ml/fish for nine days and resistance surveillance for seven days. The results showed that the difference in the amount of β-glucan and the frequency of the injected real influence on total leukocytes, phagocytic activity and resistance. Total leukocytes, phagocytic activity and resistance to treatment was best achieved by the administration of C a dose of  10 mg.kg-1 of the fish© Penyakit Motil Aeromonas Septicaemia (MAS) yang menyerang ikan nila mengalami peningkatan selama beberapa tahun terakhir sebagai konsekuensi dari kegiatan akuakultur intensif, yang menyebabkan kerugian dalam industri budidaya. Agen utama penyebab penyakit MAS adalah Aeromonas hydrophila. Untuk mengendalikan penyakit tersebut dapat dilakukan dengan pemberian β-glukan. Sebagai imunostimulan, β-glukan juga dapat  meningkatkan resistensi pada ikan nila yang dibudidayakan. Pengkajian mengenai pemanfaatan β-glukan yang diekstrak dari ragi roti Saccharomyces cerevisiae dimaksudkan untuk menguji sistem imun non spesifik ikan nila yang diuji tantang dengan bakteri Aeromonas hydrophila. Metode yang digunakan yaitu metode eksperimen dengan rancangan acak lengkap yang terdiri dari empat perlakuan dan tiga ulangan. Dosis β-glukan  yang digunakan sebagai perlakuan sebesar 0 mg.kg-1 ikan (Kontrol), 5 mg.kg-1 ikan (B), 10 mg.kg-1 ikan (C) dan 20 mg.kg-1 ikan (D), masing-masing perlakuan diinjeksi sebanyak 3 kali dengan interval waktu 3 hari selama 9 hari, volume injeksi 0,5 mL/ekor ikan dan pengamatan resistensi selama tujuh hari. Hasil penelitian menunjukkan perbedaan jumlah β-glukan dan frekuensi pemberian yang diinjeksikan memberikan pengaruh nyata terhadap total leukosit, aktivitas fagositosis dan resistensi. Total leukosit, aktivitas fagositosis dan resistensi terbaik dicapai pada perlakuan C dengan dosis 10 mg.kg-1 ikan©

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